. >> reporter: in washington, d.c., flags are flying at half staff as the country mourns with this small connecticut town that has lost so much. of course, thoughts and prayers of this entire community tonight are with those 26 victims that died here at the school. 20 young children under the age of 10 and also six adults. meanwhile, the investigation here continues. that's the story live in newtown, connecticut. chris pollone, nbc news, back to you. >> many thanks to chris. now to try to talk something sensible about this, we welcome blake zeft to the show, a former obama presidential campaign aide. we welcome back nan hayworth and mark simone. nan, let me begin with you, please. you're a doctor. >> yes. >> i know you're not a mental health doctor. but it has been alleged that he has asperger's syndrome, personality disorders -- nobody knows. does mental health play a huge role in this, from what you know? >> well, i'm the mother of two sons as well. i just can't imagine the scene at that elementary school. and of course the families whose children survived. these children who witnessed